I've been letting my outbreak of blue clove polyps run its course for the past 4 years now. So far no adverse effects that I can notice.
Also, I'm currently letting an outbreak of cyano run its course (or possibly take over my tank). Mostly I'm too lazy to do anything about it at the moment. Aside from being possibly unsightly it doesn't really harm anything.
There are some nuisances that are just that, a nuisances and inaction isn't really a problem. However, there are nuisances that if left unchecked can cause much more harm. But then, "harm" can be relative from hobbyist to hobbyist.
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